ABSTRACT The human head and hand being in the near-field zone of a mobile phone antenna can drastically influence the antenna matching with free space. The goal of the presented research is to study this phenomenon on an inhomogeneous human model for different relative positions and distances of hand and fingers when using a mobile phone. The only safety criteria commonly used to estimate RF exposure impact on humans is the specific absorption rate (SAR). Its limits are determined by the Federal Communication Commission (FCC) in the USA and the International Commission on Non-Ionizing Radiation Protection (ICNIRP) in Europe. The maximal values of SAR for a mobile handset are determined for each model by the manufacturer. In this paper, it is shown that the peak values provided by the manufacturers and their understanding may need refinement. It is almost impossible to consider all parameters, such as the dependence of SAR on antenna communication matching, with a variety of shapes and forms and other details during physical measurements or numerical estimation. The premise for such assumptions is based on the analysis of S11 dependency on the exposure scenario and the fact that the Automatic Gain Control (AGC) increases power when the signal strength at the base station drops.

中文翻译：

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非均匀人体模型上不同手指位置的手机天线匹配研究

摘要 人的头部和手部处于手机天线的近场区域，会极大地影响天线与自由空间的匹配。本研究的目的是在使用手机时手和手指的不同相对位置和距离的非均匀人体模型上研究这种现象。通常用于估计射频暴露对人体影响的唯一安全标准是比吸收率 (SAR)。其限值由美国的联邦通信委员会 (FCC) 和欧洲的国际非电离辐射防护委员会 (ICNIRP) 确定。手机的 SAR 最大值由制造商针对每种型号确定。在本文中，表明制造商提供的峰值及其理解可能需要细化。在物理测量或数值估计过程中，几乎不可能考虑所有参数，例如SAR对天线通信匹配的依赖性，具有各种形状和形式以及其他细节。此类假设的前提是基于对 S11 对暴露场景的依赖性的分析以及自动增益控制 (AGC) 在基站信号强度下降时增加功率的事实。